CN106823866A - A kind of separating and filtering film and its preparation method and application - Google Patents
A kind of separating and filtering film and its preparation method and application Download PDFInfo
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- CN106823866A CN106823866A CN201710116693.4A CN201710116693A CN106823866A CN 106823866 A CN106823866 A CN 106823866A CN 201710116693 A CN201710116693 A CN 201710116693A CN 106823866 A CN106823866 A CN 106823866A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/76—Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74
- B01D71/82—Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74 characterised by the presence of specified groups, e.g. introduced by chemical after-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
- B01D69/125—In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/36—Introduction of specific chemical groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/02—Details relating to pores or porosity of the membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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Abstract
The present invention provides a kind of separating and filtering film and its preparation method and application, the separating and filtering film includes substrate layer and the porous membrane layer positioned at substrate layer at least side, the perforated membrane is formed by nano-cellulose fibril and polyelectrolyte material, and the base material is static spinning membrane.The chemical action that the present invention passes through the group on polyelectrolyte and nano-cellulose surface, is combined with the mode of coating or infiltration with base material, and separating and filtering film is prepared for by toasting drying.The present invention is cooperated using nano-cellulose fibril and polyelectrolyte material and perforated membrane is formed on static spinning membrane, polyelectrolyte material is conducive to promoting nano-cellulose fibril gelation, and itself can film forming, the two mutual cooperation, synergy obtain the controllable perforated membrane in aperture.Preparing raw material abundance, step is few, it is easy to reaches the controllable purpose in aperture, is easier to realize heavy industrialization, has broad application prospects.
Description
Technical field
The invention belongs to technical field of polymer materials, it is related to a kind of separating and filtering film and its preparation method and application, especially
It is related to controllable separating and filtering film in a kind of aperture and its preparation method and application.
Background technology
It is catalyst that natural plants or bacteria cellulose pass through by tetramethyl piperidine nitrogen oxides, and sodium hypochlorite is oxidant
Carry out bit selecting oxidation, nano-cellulose fibril can be prepared.The fibril surface prepared carries a certain amount of carboxylic due to oxidation
Base (electrolytic dissociation in water with carboxylic acid na form) and it is negatively charged, therefore the nano-cellulose fibril prepared is deposited with aqueous dispersions
.Nano-cellulose fibril dispersion liquid under finite concentration will be assembled and form when hydrogen ion or polyvalent cation is run into
It is gel.
The method that micro-filtration and ultra-filtration and separation filter membrane are prepared with nano-cellulose fibril dispersion liquid at present, is all using energy
Hydrionic inorganic acid fluid such as hydrochloric acid etc. is provided for soak infiltrates to base material, then nano-cellulose fibril dispersion liquid is applied
Cloth is on the base material after acid solution infiltration.Assemble because dispersion liquid obtains hydrogen ion from base material, so as in the surface shape of base material
Into layer of gel, after gel toasted drying, nano-cellulose fibril forms porous film on the surface of base material.Due to nothing
Machine acid solution causes very big corrosivity to hardware, while forming pollution to air and environment.
Therefore, in the art, a kind of new separating and filtering film of exploitation and preparation method thereof is expected.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to provide a kind of separating and filtering film and preparation method thereof and should
With.
It is that, up to this purpose, the present invention uses following technical scheme：
On the one hand, the present invention provides a kind of separating and filtering film, and the separating and filtering film includes substrate layer and positioned at base material
The porous membrane layer of layer at least side, the perforated membrane is formed by nano-cellulose fibril and polyelectrolyte material, the base
Material is static spinning membrane.
In the present invention, cooperated using nano-cellulose fibril and polyelectrolyte material and formed on static spinning membrane
Perforated membrane, polyelectrolyte material is conducive to promoting nano-cellulose fibril gelation, therefore, if not using polyelectrolyte material
Material, then cannot cause the gelation of nano-cellulose fibril and then film forming, if not using nano-cellulose fibril, polyelectrolyte material
Although material itself can film forming, the aperture of its film forming caudacoria is smaller, is not easy to the regulation in aperture, therefore the two cooperates,
Synergy obtains the controllable perforated membrane in aperture, and the addition of polyelectrolyte in addition can also play enhanced to porous film strength
Effect so that the mechanical strength of the separating and filtering film for finally giving, stability and environmental suitability are improved.
In the present invention, described " be located at substrate layer at least side " refer to porous membrane layer can be positioned at substrate layer side,
It is located at substrate layer upside or downside (or above or below being expressed as), it is also possible to positioned at substrate layer both sides.
Preferably, the nano-cellulose fibril is the nano-cellulose fibril prepared by chemical oxidization method；It is excellent
Gated the nano-cellulose fibril that tetramethyl piperidine nitrogen oxides (TEMPO) oxidizing process is prepared.The nano-cellulose
Fibril surface is negatively charged, can assemble to form gel when running into hydrogen ion or other cations in solution or dispersion liquid.
Preferably, the fibre diameter of the nano-cellulose fibril is 6-10nm, and length is 300-1000nm.For example it is described
The fibre diameter of nano-cellulose fibril can be 6nm, 6.5nm, 7nm, 7.5nm, 8nm, 8.5nm, 9nm, 9.5nm or 10nm,
Length can for 300nm, 350nm, 400nm, 450nm, 500nm, 550nm, 600nm, 650nm, 700nm, 750nm, 800nm,
850nm, 900nm, 950nm or 1000nm.
In the present invention, raw material sources according to nano-cellulose fibril are different, the diameter of its nano-cellulose fibril with
And length can be different, in order to preferably coordinate polyelectrolyte to obtain the perforated membrane in appropriate aperture, also for quiet with lower floor
Electrospun membrane is adapted, and a diameter of 6-10nm preferably of the present invention, length are the nano-cellulose fibril of 300-1000nm.
Preferably, the polyelectrolyte material is polyacrylic acid, polymethylacrylic acid, polyvinyl sulfonic acid, polystyrene sulphur
Acid, polyphosphoric acid, polysilicon acid, natural acid, protein, shitosan, polyvinylamine, polyethyleneimine, polyvinyl pyridine or poly- second
In alkene alkyl dimethyl ammonium chloride any one or at least two combination, preferably polyacrylic acid, polyvinyl sulfonic acid, shitosan or poly-
In vinylamine any one or at least two combination.The polyelectrolyte material that certain present invention can be selected is not limited to
Cited specific polyelectrolyte material is stated, other suitable polymeric materials can be used for the present invention.
Polyelectrolyte material of the invention will not produce corrosiveness to equipment, to air and environmental nonpollution, safety collar
Protect.
Preferably, the weight average molecular weight of the polyelectrolyte material be 1000-1,000,000, such as 1000,1200,
1500、2000、2500、3000、4000、6000、8000、10,000、13,000、15,000、20,000、40,000、60,000、
80,000th, the preferred 1000-100,000 in 100,000,300,000,500,000,800,000 or 1,000,000.
In the present invention, the ionizing group of polyelectrolyte material has repeatability, it is preferable that the polyelectrolyte material institute
The ionogen for containing is no less than 10, the number of such as ionogen can for 10,13,15,18,20,
25,28,30,50,100,150,200,300,500,800,1000,1500,2000,
It is 5000,8000,10000,15000, even more.An appropriate number of ionogen of polyelectrolyte material, has
Interacted with nano-cellulose fibril beneficial to it, be conducive to fast filming.
In the present invention, the electrolysis cation in polyelectrolyte material can be sent out with the negative electrical charge on nano-cellulose fibril
It is raw to interact so that nano-cellulose fibril forms gel, and polyelectrolyte from as macromolecular material, and it has film forming
Property, with itself film forming in nano-cellulose fibril interaction process so that obtain nano-cellulose fibril and polyelectrolyte
The composite membrane of material, and the two mutual cooperation can adjust pore size of the perforated membrane of formation, obtain controllable many in aperture
Pore membrane.
Preferably, when the polyelectrolyte material is the poor polymeric material of film forming, using crosslinking agent to poly- electricity
Solution material carry out it is cross-linking modified, to improve the film forming of polyelectrolyte material.
In the present invention due to the application of polyelectrolyte material, it is also possible to assign separating and filtering film certain feature, example
Such as when polyelectrolyte material uses shitosan, can cause that the separating and filtering film for obtaining has antibiotic property under the conditions of micro- acid
Energy.
Preferably, the static spinning membrane is polyacrylonitrile static spinning membrane, PLA static spinning membrane, polylactic acid-glycolic
Any one in guanidine-acetic acid static spinning membrane, shitosan static spinning membrane or carbon nanometer tube static spinning membrane or at least two
Combination, preferably polyacrylonitrile static spinning membrane.In the present invention, the static spinning membrane is not limited to specific reality listed above
Example, can also use other static spinning membranes certainly.
Preferably, the pore size of the static spinning membrane be 100nm-10 μm, for example can for 300nm, 350nm,
380nm、400nm、430nm、450nm、480nm、500nm、550nm、580nm、600nm、650nm、700nm、750nm、
800nm, 850nm, 900nm, 950nmhuo 1000nm, preferably 300nm-1 μm.
Preferably, the pore size of the separating and filtering film be 10-100nm, such as 10nm, 13nm, 15nm, 18nm,
20nm、25nm、30nm、35nm、40nm、45nm、50nm、55nm、60nm、65nm、70nm、75nm、80nm、85nm、90nm、
95nm or 100nm, preferably 10-50nm.
On the other hand, the invention provides the preparation method of separating and filtering film as described above, methods described includes following
Step：
(1) base material is coated or impregnated with using polyelectrolyte solution, obtains the base material containing polyelectrolyte material；
(2) using nano-cellulose fibril dispersion liquid be coated or impregnated with that step (1) obtains containing polyelectrolyte material
Base material, is dried to obtain the separating and filtering film.
The chemical action that the present invention passes through the group on polyelectrolyte and nano-cellulose surface, with coating or the side of infiltration
Formula is combined with base material, and separating and filtering film is prepared for by means such as drying, heat cross-linkings.
Preferably, step (1) described polyelectrolyte solution be by the polyelectrolyte material solution for obtaining soluble in water or
The polyelectrolyte solution prepared by way of polymerisation in solution.
Preferably, the concentration of step (1) described polyelectrolyte solution be 0.002%-10%, such as 0.002%,
0.005%th, 0.008%, 0.01%, 0.03%, 0.05%, 0.08%, 0.1%, 0.3%, 0.5%, 0.8%, 1%,
1.2%th, 1.5%, 1.8%, 2%, 2.3%, 2.5%, 2.8%, 3%, 3.5%, 4%, 4.5%, 5%, 6%, 7%, 8%,
9% or 10%, preferably 0.01%-2%, further preferred 0.05%-1%.
Preferably, step (2) the nano-cellulose fibril dispersion liquid is by receiving that chemical oxidation method is prepared
Rice cellulose fibril dispersion liquid；It is preferred that the nanometer prepared by tetramethyl piperidine nitrogen oxides (TEMPO) catalytic oxidation
Cellulose fibril dispersion liquid.Tetramethyl piperidine nitrogen oxides (TEMPO) catalytic oxidation is a kind of positioning catalytic oxidation.
Preferably, the mass percent of nano-cellulose fibril contains in step (2) the nano-cellulose fibril dispersion liquid
It is 0.002%-1.0% to measure, such as 0.002%, 0.004%, 0.006%, 0.008%, 0.01%, 0.02%, 0.04%,
0.06%th, 0.08%, 0.1%, 0.3%, 0.5%, 0.7%, 0.9% or 1%, preferably 0.002%-0.5%.
In the present invention, can be compared with the case where the concentration of polyelectrolyte solution and nano-cellulose fibril dispersion liquid cooperates
Regulate and control the pore size of separating and filtering film well, if concentration is excessive or too small, may have influence on separating and filtering membrane aperture
Formed, be likely to result in that aperture is excessive, or the film for producing is excessively fine and close, aperture is too small, causes the film embrittlement for producing, and does not utilize
Production and application.
Preferably, step (2) described drying is for baking is dried or is spontaneously dried.
Preferably, step (2) the dry temperature be 30-150 DEG C, such as 30 DEG C, 40 DEG C, 50 DEG C, 60 DEG C, 70 DEG C,
80 DEG C, 90 DEG C, 100 DEG C, 110 DEG C, 120 DEG C, 130 DEG C, 140 DEG C or 150 DEG C, preferably 80-150 DEG C.
Preferably, step (2) the dry time be -24 hours 2 minutes, such as 2 minutes, 5 minutes, 10 minutes, 20
Minute, 30 minutes, 40 minutes, 50 minutes, 1 hour, 3 hours, 5 hours, 8 hours, 10 hours, 13 hours, 15 hours, it is 18 small
When, 20 hours, 22 hours or 24 hours.
In the present invention, by the selection of polyelectrolyte and nano-cellulose fibril, and to Polyelectrolyte Concentration with
And the regulation of the concentration of nano-cellulose fibril dispersion liquid etc., prepare the separating and filtering film in controllable screening aperture.
On the other hand, the application the invention provides separating and filtering film as described above in material separating and filtering.
Separating and filtering film of the invention can apply to the water process, separation of different molecular weight organic matter or protein, micro-
The aspects such as separation, air filtration, the water-oil separating of biological and zymotic fluid, with application prospect widely.
Relative to prior art, the invention has the advantages that：
(1) present invention is cooperated using nano-cellulose fibril and polyelectrolyte material and forms many on static spinning membrane
Pore membrane, polyelectrolyte material is conducive to promoting nano-cellulose fibril gelation, and itself can film forming, the two mutual cooperation, association
Same-action obtains the controllable perforated membrane in aperture.
(2) addition of polyelectrolyte can also play enhanced effect to porous film strength so that what is finally given divides
Mechanical strength, stability and environmental suitability from filter membrane are improved.
(3) the preparing raw material abundance of separating and filtering film of the present invention, step is few, it is easy to reach the controllable mesh in aperture
, it is easier to realize heavy industrialization, have broad application prospects.
Specific embodiment
Technical scheme is further illustrated below by specific embodiment.Those skilled in the art should be bright
, the embodiment be only to aid in understand the present invention, be not construed as to concrete restriction of the invention.
Embodiment 1
As base material, weigh 50g weight average molecular weight is polyacrylonitrile static spinning membrane with pore size as 300nm-500nm
2000 polyacrylic acid, its theoretical ionizing group number is 27-28, and the solution that mass fraction is 1.0% is diluted to pure water,
Polyacrylic acid solution is fully soaked polyacrylonitrile static spinning membrane, unnecessary polyacrylic acid solution is removed, oxygen is catalyzed with TEMPO
Change method prepares mass fraction for 0.04% nano-cellulose fibril dispersion liquid, wherein the fibre diameter of nano-cellulose fibril
It is 6-10nm, length is 300-600nm, and the homogeneous dispersion is applied on the base material for scribbling polyacrylic acid solution, is put into
Baking oven is toasted, and baking temperature is 120 DEG C, and baking time is 20 minutes, is taken out, and obtains final product the separation that aperture is 40-70nm
Filter membrane.
Embodiment 2
As base material, weigh 40g weight average molecular weight is polyacrylonitrile static spinning membrane with pore size as 100nm-500nm
2400 polyacrylic acid, its theoretical ionizing group number is 32-34, and the solution that mass fraction is 1.0% is diluted to pure water；
Polyacrylic acid solution is fully soaked into static spinning membrane, unnecessary polyacrylic acid solution is removed, is prepared with TEMPO catalytic oxidations
Mass fraction is obtained for 0.05% nano-cellulose fibril dispersion liquid, wherein the fibre diameter of nano-cellulose fibril is 6-
10nm, length is 300-800nm, and the homogeneous dispersion is applied on the base material for scribbling polyacrylic acid solution, 30 DEG C of normal temperature,
Dry 24 hours, obtain final product the separating and filtering film that aperture is 35-60nm.
Embodiment 3
It is 300nm-1 μm of polyacrylonitrile static spinning membrane as base material with pore size, is passed through using peroxidation sulfuric acid potassium
Solution polymerization process prepares the polyacrylic acid that weight average molecular weight is 8000, and its theoretical ionizing group number is 110-120, and
It is 0.5% to be diluted to mass fraction, and polyacrylic acid solution is fully soaked electrospinning film, removes unnecessary polyacrylic acid solution, will
The mass fraction for having prepared is 0.035% nano-cellulose fibril dispersion liquid, and the fiber of wherein nano-cellulose fibril is straight
Footpath is 6-10nm, and length is 300-1000nm, and the homogeneous dispersion is applied on the base material for scribbling polyacrylic acid solution, is put
Enter baking oven to be toasted, baking temperature is 140 DEG C, baking time is 12 minutes, is taken out, obtain final product the separation that aperture is 20-50nm
Filter membrane.
Embodiment 4
As base material, weigh 20g weight average molecular weight is polyacrylonitrile static spinning membrane with pore size as 300nm-500nm
1200 polyvinyl sulfonic acid, its theoretical ionizing group number is 10-12, with pure water be diluted to mass fraction be 0.5% it is molten
Liquid；Polyvinyl sulfonic acid solution is fully soaked into electrospinning film, unnecessary polyvinyl sulfonic acid solution, the quality that will have been prepared is removed
Fraction is 0.035% nano-cellulose fibril dispersion liquid, and the wherein fibre diameter of nano-cellulose fibril is 6-10nm, and length is
300-500nm, the homogeneous dispersion is applied on the base material for scribbling polyvinyl sulfonic acid solution, is put into baking oven and is toasted,
Baking temperature is 100 DEG C, and baking time is 10 minutes, is taken out, and obtains final product the separating and filtering film that aperture is 40-65nm.
Embodiment 5
Polyacrylonitrile static spinning membrane with pore size as 300nm-800nm as base material, prepare mass fraction and be by dissolving
(deacetylation is 80.0-95.0% to 0.1% shitosan；Viscosity is 50-800mPas) solution, its theoretical ionizing group
Number is 100-300, takes the polyacrylonitrile static spinning membrane of certain area, is fully soaked with chitosan solution, and it is unnecessary to remove
Chitosan solution, the mass fraction that will have been prepared is 0.2% nano-cellulose fibril dispersion liquid, wherein nano-cellulose
The fibre diameter of fibril is 6-10nm, and length is 300-500nm, and being applied to for the homogeneous dispersion is scribbled into chitosan solution
On base material, it is put into baking oven and is toasted, baking temperature is 140 DEG C, baking time is 10 minutes, is taken out, obtains final product aperture for 15-
The separating and filtering film of 35nm.
Embodiment 6
Polyacrylonitrile static spinning membrane with pore size as 300nm-800nm as base material, weigh it is a certain amount of it is heavy divide equally
Son amount is 700000 polyvinylamine, and its theoretical ionizing group number is 1,2000-1,2100, and quality point is diluted to pure water
Number is 0.1% solution；Polyvinylamine solution is filled into part immersion electrospinning film, unnecessary polyvinylamine solution is removed, will have been made
The mass fraction got ready is 0.2% nano-cellulose fibril dispersion liquid, and wherein the fibre diameter of nano-cellulose fibril is 6-
10nm, length is 300-1000nm, and the homogeneous dispersion is applied on the base material for scribbling polyvinylamine solution, is put into baking oven
Toasted, baking temperature is 130 DEG C, baking time is 15 minutes, is taken out, obtained final product the separating and filtering film that aperture is 10-30nm.
Embodiment 7
Difference from Example 1 is that wherein the concentration of polyacrylic acid solution is 2%, the dispersion of nano-cellulose fibril
The concentration of liquid is 0.5%, and remaining preparation condition and method are same as Example 1, the pore size of the separating and filtering film for obtaining
It is the separating and filtering film of 25-55nm.
Embodiment 8
Difference from Example 1 is that wherein the concentration of polyacrylic acid solution is 5%, the dispersion of nano-cellulose fibril
The concentration of liquid is 0.8%, and remaining preparation condition and method are same as Example 1, the pore size of the separating and filtering film for obtaining
It is the separating and filtering film of 18-30nm.
Embodiment 9
Difference from Example 1 is that wherein the concentration of polyacrylic acid solution is 10%, the dispersion of nano-cellulose fibril
The concentration of liquid is 1%, and remaining preparation condition and method are same as Example 1, and the pore size of the separating and filtering film for obtaining is
The separating and filtering film of 15-27nm.
Applicant state, the present invention illustrated by above-described embodiment separating and filtering film of the invention and preparation method thereof and
Using, but the invention is not limited in above-described embodiment, that is, do not mean that the present invention has to rely on above-described embodiment and could implement.
Person of ordinary skill in the field is it will be clearly understood that any improvement in the present invention, equivalent the replacing to each raw material of product of the present invention
Change and auxiliary element addition, the selection of concrete mode etc., all fall within protection scope of the present invention and it is open within the scope of.
Claims (10)
1. a kind of separating and filtering film, it is characterised in that the separating and filtering film includes substrate layer and positioned at substrate layer at least
The porous membrane layer of side, the perforated membrane is formed by nano-cellulose fibril and polyelectrolyte material, and the base material is electrostatic
Spinning film.
2. separating and filtering film according to claim 1, it is characterised in that the nano-cellulose fibril is by chemical oxygen
The nano-cellulose fibril that change method is prepared；It is preferred that by receiving that tetramethyl piperidine nitrogen oxide catalyst oxidizing process is prepared
Rice cellulose fibril.
3. separating and filtering film according to claim 1 and 2, it is characterised in that the fiber of the nano-cellulose fibril is straight
Footpath is 6-10nm, and length is 300-1000nm.
4. the separating and filtering film according to any one of claim 1-3, it is characterised in that the polyelectrolyte material is poly-
Acrylic acid, polymethylacrylic acid, polyvinyl sulfonic acid, polystyrolsulfon acid, polyphosphoric acid, polysilicon acid, natural acid, protein, shell
Any one in glycan, polyvinylamine, polyethyleneimine, polyvinyl pyridine or polyethylene alkyl dimethyl ammonium chloride or at least two
Combination, preferably any one in polyacrylic acid, polyvinyl sulfonic acid, shitosan or polyvinylamine or at least two combination；
Preferably, the weight average molecular weight of the polyelectrolyte material is 1000-1,000,000, preferably 1000-100,000.
5. the separating and filtering film according to any one of claim 1-4, it is characterised in that contained by the polyelectrolyte material
Ionogen be no less than 10.
6. the separating and filtering film according to any one of claim 1-5, it is characterised in that when the polyelectrolyte material is
During the poor polymeric material of film forming, polyelectrolyte material is carried out using crosslinking agent cross-linking modified；
Preferably, the static spinning membrane is polyacrylonitrile static spinning membrane, PLA static spinning membrane, polylactic acid-glycolic base second
In sour static spinning membrane, shitosan static spinning membrane or carbon nanometer tube static spinning membrane any one or at least two group
Close, preferably polyacrylonitrile static spinning membrane；
Preferably, the pore size of the static spinning membrane is 100nm-10 μm, preferably 300nm-1 μm.
7. the separating and filtering film according to any one of claim 1-6, it is characterised in that the aperture of the separating and filtering film
Size is 10-100nm, preferably 10-50nm.
8. the preparation method of the separating and filtering film according to any one of claim 1-7, it is characterised in that methods described bag
Include following steps：
(1) base material is coated or impregnated with using polyelectrolyte solution, obtains the base material containing polyelectrolyte material；
(2) base material containing polyelectrolyte material that step (1) is obtained is coated or impregnated with using nano-cellulose fibril dispersion liquid,
It is dried to obtain the separating and filtering film.
9. preparation method according to claim 8, it is characterised in that step (1) described polyelectrolyte solution is by poly-
The electrolyte solution for obtaining soluble in water or the polyelectrolyte solution prepared by way of polymerisation in solution；
Preferably, the concentration of step (1) described polyelectrolyte solution be 0.002%-10%, preferably 0.01%-2%, further
It is preferred that 0.05%-1%；
Preferably, step (2) the nano-cellulose fibril dispersion liquid is the Nanowire prepared by chemical oxidation method
The plain fibril dispersion liquid of dimension；It is preferred that the nano-cellulose fibril point prepared by tetramethyl piperidine nitrogen oxide catalyst oxidizing process
Dispersion liquid；
Preferably, the mass percentage content of nano-cellulose fibril is in step (2) the nano-cellulose fibril dispersion liquid
0.002%-1.0%, preferably 0.002%-0.5%；
Preferably, step (2) described drying is for baking is dried or is spontaneously dried；
Preferably, step (2) the dry temperature is 30-150 DEG C, preferably 80-150 DEG C；
Preferably, step (2) the dry time is -24 hours 2 minutes.
10. application of the separating and filtering film according to any one of claim 1-7 in material separating and filtering.
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| CN110860214A (en) * | 2019-12-19 | 2020-03-06 | 上海洁晟环保科技有限公司 | Base film layer, preparation method thereof and composite nanofiltration membrane containing base film layer |
| WO2021003599A1 (en) * | 2019-07-05 | 2021-01-14 | 大连理工大学 | Carbon nanotube/nanofiber conductive composite membrane and manufacturing method therefor |
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| CN116212527A (en) * | 2023-03-10 | 2023-06-06 | 天津工业大学 | Preparation method of aerogel filter with sandwich structure for oil mist filtration |
| CN116212527B (en) * | 2023-03-10 | 2024-05-21 | 天津工业大学 | Preparation method of aerogel filter with sandwich structure for oil mist filtration |
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